Market competition and price of disease management programmes: an observational study

Table 1 Association between competition of care groups and health insurers, and price of DMPs based on linear regression analyses ^#

	Univariate linear regression	Multivariate linear regression^$
	Effect (95% CI)	Effect (95% CI)	Effect (95% CI)^§
Insurer market concentration (HHI)	0.004 (-0.008-0.017)	0.009 (-0.005-0.024)	0.009 (-0.005 - 0.024)
Number of care groups in region	-4.78 (-8.41 - -1.15)*	-4.68 (-8.36 - -1.00)*
Care group market share^$	0.49 (-0.16 - 1.15)		0.37 (-0.31 - 1.05)

^#Analyses were adjusted for the percentage of persons with a low income (lowest 40% of the whole country) and the percentage of persons with a western and non-western nationality in a GGD region; ^$based on 63 care groups since no data were available on the number of GPs for 13 care groups; ^§Total variance explained (R²): 9% and 10%; *p < 0.05.

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